Income Taxes - Components of Expense and Earnings (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current Income Tax Expense (Benefit) [Abstract]
Federal	$ 7,216	$ 3,318	$ 3,485
State	263	(69)	385
Foreign	13,040	9,972	7,955
Current Income Tax Expense (Benefit), Total	20,519	13,221	11,825
Deferred Income Tax Expense (Benefit) [Abstract]
Federal	155	4,409	2,022
State	138	(794)	0
Foreign	(323)	(1,261)	409
Income Tax Expense (Benefit), Total	20,489	15,575	14,256
Components Of Earnings Before Taxes [Abstract]
Domestic	25,900	26,520	24,071
Foreign	46,926	36,428	35,306
Income before taxes and equity in net income of associated companies	$ 72,826	$ 62,948	$ 59,377